ed@water:~$ sudo apt-get install libpath-class-perl
Reading package lists... Done
Building dependency tree... Done
The following NEW packages will be installed
  libpath-class-perl
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 32.9kB of archives.
After unpacking 81.9kB of additional disk space will be used.
Get: 1 http://mirror.positive-internet.com etch/main libpath-class-perl 0.15-1 [32.9kB]
Fetched 1B in 0s (6B/s)                    
Failed to fetch http://mirror.positive-internet.com/debian/pool/main/libp/libpath-class-perl/libpath-class-perl_0.15-1_all.deb  Size mismatch
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
ed@water:~$